(a) Subject to section 321.1110 , a plan of merger must be consented to by all the partners of a constituent limited partnership.
(b) Subject to section 321.1110 and any contractual rights, after a merger is approved, and at any time before a filing is made under section 321.1108 , a constituent limited partnership may amend the plan or abandon the planned merger:
(1) as provided in the plan; and
(2) except as prohibited by the plan, with the same consent as was required to approve the plan.